Chimney cowl



FIG. 1 is an isometric view of a chimney cowl showing my new design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a rear elevation thereof, and

FIG. 4 is a left side elevation thereof, the right side being a mirror image of the left side shown thereof. 

The ornamental design for a chimney cowl, as shown and described. 